Answers: A. The ratio of the shaded squares to squares that are not shaded is 33 to 67
B. The ratio of the shaded squares to squares that are not shaded is 67 to 33
C. 33/100 of the grid is shaded
D. 67/100 of the grid is not shaded
E. 33% of the grid is not shaded
F. 67% of the grid is not shaded